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| variable = [[Cepheid variable|Cepheid]]?<ref name=Henriksson1977/> ...ned near the [[instability strip]] and in 1977 was listed as a candidate [[cepheid variable star]]<ref name=Gorynya1998/> with a luminosity [[amplitude]] of 0 ...

...Granzer |first8=T. |last9=Strassmeier |first9=K. G. |title=Calibrating the Cepheid period-luminosity relation from the infrared surface brightness technique: ...own relation is the [[direct proportionality]] law holding for [[Classical Cepheid variable]]s, sometimes called the '''Leavitt Law'''.<ref name="NYT-20240327 ...

...s '''Population I Cepheids''', '''Type I Cepheids''', and '''Delta Cepheid variables'''. ...}</ref> [[Hubble Space Telescope]] (HST) observations of classical Cepheid variables have enabled firmer constraints on [[Hubble's law]], which describes the ex ...

...eld|first3=M.|last4=David|first4=P.|year=1992}}</ref> + [[Cepheid variable|Cepheid]]<ref name=wds/> ...rnal |last1=Weber |first1=R. |title=Observations photographiques d'étoiles variables peu connues (in French) |journal=Journal des Observateurs |date=January 195 ...

...veness in the [[Irregular variable|irregular]] variables. The [[W Virginis variables]] are at the interface; the short period ones are regular and the longer pe ...ators, which have smaller fluctuations in brightness than those of regular variables used as standard candles.<ref>{{cite journal|bibcode=2010ApJ...713L.192G|ti ...

RV Tauri variables often have somewhat irregular light curves, both in amplitude and period, b ...tus of R Scuti is uncertain and estimates of the mass vary wildly. RV Tau variables as post-AGB stars are expected to have masses near or below that of the sun ...

|Protoype of the [[Classical Cepheid variable]] stars. ...|last2=Booth |first2=Andrew J. |date=1998-08-01 |title=The bright southern Cepheid beta Doradus: the radial velocity curve, distance and size |bibcode=1998MNR ...

...f this gap on a section of the diagram called the [[instability strip]]. [[Cepheid variable]]s also fall on the instability strip, at higher luminosities. ...

...ght stars beyond 50&nbsp;parsecs and giant [[variable star]]s, including [[Cepheid variable|Cepheids]] and the [[RR Lyrae variable]]s.<ref> ...

...]] measurements, use of [[standard candles|standard references]] such as [[cepheid variable]]s or [[Type Ia supernova]]s, or [[redshift]] measurement. [[Astro ...